Corrosion Resistance of UNS N04400 vs Electroless Nickel in Simulated Marine Service
Bibliographic record
Abstract
Abstract UNS N04400 cladding on steel valves can corrode during marine service, most seriously in the form of grooves or pits. Re-cladding of valves that are welded to the hull is very costly because of the processes of removal and re-attachment. There is then a need to develop techniques to repair these valves in-situ without removing them from the hull. The present work investigated the potential of plating with electroless nickel (EN) for repair. In this technique, a layer of about 90% nickel (the balance is phosphorous) is deposited chemically onto the damaged surface. A non-electrolytic cleaning technique was developed to allow EN to coat over the bottom of corrosion pits. The uniform corrosion rate of an EN coating in artificial seawater was measured by electrochemical impedance spectroscopy and was found to be less than that for N04400. Both N04400 and EN form a protective anodic layer in artificial seawater. The tendency towards pitting and crevice corrosion of an EN coating was also found to be better than that of N04400. The main conclusion from this work is that an EN coating could be a viable solution to repair N04400-clad valves in-situ.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".